Liquid flow control device



JulyA 22, 1952 J. o. THoRsHExM 2,604,112

LIQUID FLOW CONTROL DEVICE Filed July 1o, 1944 3 sheets-sheet 1 l. /ivJ-l/ 67 79 a; 17 W a@ 8 7i W 76 u 727 l 73 77 l Gttorneg July 22,v 1952'J. O. THORSHEIM LIQUID FLOW CONTROL DEVICE 3 Sheets-Sheet 2 Filed July10, 1944 i" .5. j wxwf f I/ July 22, 1952 J. o. THoRsHElM 2,604,112

LIQUID FLow coNIRoL DEVICE Y Filed July 10, 1944 I S-Sheets-SheetV 3Gttomeg atentecl july 22., 1.952

UNITED STATES, PATENT oFFlcE LIQUID FLovll'RoL DEVICE I i Y signor to.Minneapolis-Honeywell Regulator Company, Minneapolis, Minn., acorporation of Delaware Application July 10, 1944, Serial No. 544,317

. 1 Y A y My invention is broadly related to an improved device forcontrolling the flow of liquid. While devices of this nature may haveutility in many fields where the accurate control of theflow of liquidis essential, it has particular utility in con- `junction with gravityfed type liquid Yfuel burning furnaces.` Y Y i In liquid fuel burningfurnaces of this type. the fuel is constantly fed through a conduit tothe burner, but the rate ofI iiovvV is dependent upon the demand of thespace whose temperature is being controlled. When the demand for heathas been satisfied the flow of fuelmustl be reduced to the mosteconomical quantity which will still be suicient to supporta pilotflame, and as the heating value of this form of combustion is of littlerelative Value, it is of principal importance that the quantity be assmall as practicable. In a majority of the control devices' of the priorart, the flow of liquid is` controlled by a metering valve. Thisarrangement has an inherent fault in that sediment and residual mattercarried by the fuel has a tendency to'clog the -valve structure and thusinterfere with the constant flow of liquid. In more' recent times,several arrangements have appeared which utilize mechanically movingparts which obviate the older difficulty,

'but with the latter devices the quantity of fuel 'fed for the purposeof supporting pilot `combustion is still excessive. e. Y

One object of my invention is to provide one or more unrestrictedconduits which will properly regulate the ow of liquid and which. arefree lof the objections found in devices of the prior art. Althoughthese conduits may take one o r more forms, I prefer an arrangementwhich provides flow by a Siphon-like device, wherein the rate of iioWmay be controlled by vertically moving the .device wit-h relation to thelevel of liquid in a chamber arranged to maintain a substantiallyconstant liquid level.

Another object is to provide a device in which the uninterrupted ow offuel to support pilot combustion may be reduced to as little as onehalfpint of liquid fuelin twenty-four hours.

A further object is to vprovide a-device for the control of the flow ofliquid fuelin a pluralityof quantities, as for example, to supportcombustion for low, intermediate, or high fire demand.

Another object is to provide inra liquid fuel feeding device, means forshutting olf the vflow of fuel in the event of llame failure.

Another object is to provide in a liquid fuel feeding device, means forshutting olf the iiow of fuel in the event the furnace exceeds apredetermined high temperature. v

Another object is to provide in a liquid fuel feeding device of thistype which uses an unrestricted conduit, means foi-initiating flow ofliquid through the conduit andffurtherfmeans for terf 29 Claims. (c1.137-126) minating the flow of liquid through the conduit. A 4furtherObjectis to provide in a liquid fuel feeding device of this type, whichaccording to safety regulations must have an overflow chamber, means foremptying said overflow chamber into the normal outlet conduit leadingtothe burner. Numerous otherA and "further advantages will be madeevident in the succeeding description and claims, and in theappendeddrawingsv in which:

Figure 1 is a view/in side elevation-of the control device with certainportions. being broken away and others shown in cross section;LV

, Figure 2 is a top elevation of the devicetakenontheline'l---2ofFigure1;4 Y* 5 1 Figure 3 is a crosssectional view inside elevation of the liquid inlet valve;

Figure 4 is a cross-sectional-view in Aside 'elevar tion of amodification of means'for initiatingV flow of liquid and means forterminating the same;

Figure 5 is a top elevation Yof'A certain parts show ninFigurefi; Figure6 is a broken away 'side elevation of Vanother means forterminatingliquidjflowito the burner;

Figure '7 is liquid flow control means-wherein, flow is depend'- entupon the surface tension Vof the liquid;

Figure 8 is a crosssection of a modification of automatic means forinitiating and terminating flow of liquid throughthe siphonic conduit;Figure 9 is a cross-section of another modifica'- tion of means forinitiatingand terminating the flow of liquid through the siphonicconduit; and. Figure 10 is a schematicV view of agwiringgdiagram inwhich a plurality of conduits are placed under the operable control'of aspace thermostat. The device will now bejexplained in detailjand byreferring to Figures 1 and 2, the reference numeral I5 indicates'a sideof a Afurnace to which the device has been attached to provide liquidfuel for a burner (not shoWni'Within-said furnace. The device consistsof acasting llisecured to .the furnace wall I5 by screwsor boltsl I1which'ad'- justably fit in the slotteda'pertures- I8insuchja manner thatthe device may be readilyremoved. A cover'plate or casing I9' completelyencloses the entire device so 'that none of the operating por-'- tionsextend exterior of the "casing in 'sucha manner that they might betamperedwith by an unauthorized person. The cover I9 is secured to thedevice by bolt 20. f Following the normal course of the. fluid fuelthrough this control device, reference numeral 2I indicates aninteriorly threadediboss .which serves as a fluid inletl and is normallyconnected to a tank or other liquidv source which is so situated thatthe liquid enters 'the' device by gravity. After -entering the device,Y.thegliquid iiows through afilter or strainer'element indi- Vaperspective of a modification of -serves to support the lter element 25,which may be made of ne wire mesh. The lter `element 25 is secured to anannular ring 25 which Y is positioned in the annular: shoulderV orrecess22. secured by soldering or the like within the inner recess of member25 and is held -incompression by the cap 28 which is threaded into anupper potion of the body member '23. An outlet .pas-

sage 29 communicates with the area around the i exterior of the mesh25for conducting liquid to rtheinlet valve structureto be explainedhereinafter. It will be observed that mounting the strainer in T thismanner has a distinct advantage, forwhenvitis desired to remove the meshelement25 for cleaning, yit is onlyA necessary to unscrew the cap 28whence the entire strainer may be removed las a unit, consisting of thespring 2l, the annular ring 26, and mesh 25. The strainer maybe removedfrom the top of the device without, the `necessity of draining liquidfrom any portion of the device and without causing a spilling oftheliquid. Y -V `The inlet valve `structure indicated by the referencenumeral 35 is shown generally in `Figures 1 and 2 and in detail inFigure 3. It consists Vof a body Vmember3| formed integral with theltercasing 23 and contains the internal 'passage 29 which constitutes theoutlet from the strainer. A closelylfltting insert 32 situated withinthe member 3| 4provides a small passageway 34 'which connects passage 29with a wider passageway 35 and an outlet Sli.` At the junction of thepassageways 34, 35, the restriction provides an annular valve seat 31.VA needle valve 38 is slidably mounted within the passage 35 and has alportion of reduced diameter 39 with a tapered portion 40 for engagementwith the valve seat 37, to cut` oi the Viiow of Aliquid to the outletS6. At the'opposite end,valve 3B has an enlarged head 4I, intended forengagement with an operating member. "A' spring 42 slidably lits Vover areduced 'portion '33 of the insert 32 and engages a ,washer 473`positioned under the head 4| of the needle valve 38. The action of thespring 42 is to hold the needle valve 38'in a normally open position topermit the iiow of liquid from the passage 25 to the outlet 36. Thevalve 38 is moved to a closed position by engagement with means 53 to beexplained hereinafter.

A chamber 50 having an open top is provided for receiving the liquidpassing through the valve outlet 3B and is provided with a pair of posts5| which are suitably fastened within the bottom c'f the chamber 59. Thechamber 5|! is intended tof maintain a substantially constant level ofliquid therein, but has a U-shaped opening 52 on its upper edge toprovide achannel for overflow of liquid should the inlet valve structureexplained above, fail to function properly. Means 53 comprises a hairpinshapedlever member pivotally connected at one end to posts by a pin54which extends between the posts 5|. The lever 53 extends downwardlywithin the chamber and has suitably connected toit a bimetallic ele-`ment 55 which forms` a portion of the lever and functions to alter theliquid level inthe chamber in response to a change of the liquidtemperature. The other upper extension of lever'53'is secured by yapivotpin 56 to valve structure VV30 and is A` helically wound expansionspring 2l is 4 connected to a pair of arms 51 which extend laterally oneither side of the valve structure 30. Suitably fastened to thel arms57| are a pair of weights 58 which are of suihcient mass tocounterbalance the chamber 5i) on the pivot 56 when the liquid inchamber 5G has reached a predetermined constant level.

v,When vthe chamber 50 is empty, it will be held inthe position shown inthe full line of Figure 1 by the weightsi58 and liquid will pass throughthe valve structure 35 into said chamber. As the liquid reaches thesubstantially predetermined upper level, the combined weight of theliquid and the chamber 50 will approach an equilibrium with the weightof the counterpoise members 58, at which time the lever 53 will rotateonthe pins 54 and 56, to engage the head 4I oi valve 38 to move it to aclosed position. Thereafter the parts will assume the position shown inthe dotted lines shown in Figure 1. The bimetallic element 55' willunder normal conditions be vin its straight line position shown inFigure 1, but its function is to compensate for variations in theviscosity of the liquid brought about by temperature variations and tocompensate for temperature changes thereof. In the event that thetemperature of the liquid entering chamber 50 is unusually cool, thebimetal '55 will warp to the right as seen in Figure 1, to cause pin 54to move in the direction of pin 55, thus tending to shorten theoperativelength of lever 53 thereby shifting the vcenter of gravityi formedby thelever 53 and pin 54 and will thus cause a somewhat greater amount of oilto enter the chamber 50 before lever 53 moves to close the valve 38. Onthe other hand, should the temperature of the liquid be above that whichwould be regarded as a normal temperature, the bimetal 55- will warp tothe leftl to cause aY closing of valve 38 ata lower liquid level inchamber 50 than is otherwise normal. Thus, for reasons to be explainedhereinafter, it will be seen that-I compensate for a diierence inviscosity of the oil caused by temperature change, by raising orlowering the substantially constant level of the liquid in the chamber50. Y Y

To providea means ofmetering the liquid yout of the constant levelchamber, I provide a pilot siphon 50 and one or more larger siphons 6|and 62, although an alternative conduit structure which I have found washighly eiiicient, is shown in Figure 7. Referring now to Figure 1, thepilot siphon 60 is formed of a piece of seamless tube in such a mannerthat there Vwill be no restriction at either of its open ends or at anyof its curved portions. suitably fastened to the upper portion .of thesiphon 60 is a rod 63.,l which in turn is siphon with relation to thehead of the liquid inv the constant level chamber. A threaded screw 51extending through an vaperture in bracket 56 is provided Vfor manuallymovingbracket 64 in a vertical manner to thereby manually adjust theposition of pilot siphon 60 with relation'to the liquid in the constantlevel kchamber l5|).

A plate member 68 is mounted over the chamber 50 to provide support forbracket 66' and a plurality of other devices and parts which cooperatetov providel for the proper operation of the control device. Abimetallic element 1U which is intended to operate either of siphons 6|or 62 issuitably fastened to the plate 68 by a stud 69, `suitably Woundyin heat exchange lrelation with one portion o f the bimetal element isan electrical heating element 1| which is connected at one end by thewire 12 to a terminal 13 and at the other end by a wire 14 to a terminal15. The terminals 13 and 15 are insulatingly mounted on a member `16which is secured to the plate 68 by screws 11. These terminals areprovided for receiving an electrical current from a temperature controldevice such as a room thermostat, which would be suitably mounted in thespace whose temperature is to be controlled.`

As in the manner of the pilot siphon 60, the main siphon 6| has a rod 18attached to an upper portion of the siphon. Rod 18 is fastened to anupturned end 19 of the'bimetallic element 10. The bimetallic element 10is normally in a raised position with the end portion 19 abutting thebracket 66 but when heated by an Aelectric current passing through theresistance 1|, is arranged to warp downwardly, moving siphon 6| in adownward direction with relation to the liquid level in the container50. A bracket in the form of a stop member 8D is made adjustable withrelation to a bracket 8| by a screw-82 so as to limit the movement ofthe rod 18 in its downward movement and therefore limit themovement ofthe siphon 6| with relation tothe head of the liquid in chamber 50 tothereby control the rate of liquid flow through` the siphon 6|. As longas the winding 1| isi energized or heated, the siphon will remain in itsdownward position, but when the source of the heat has abated, it willreturn to its normally elevated position. A strain release spring 83 ishelically Wound on the stud 69 to provide a resilient means of absorbingthe additional contortioncaused by continued heating of the bimetal10'after it has reached the limit of its downwardA movement as definedby the position'of the adjustable stop 8D. A similar arrangement may beprovided for the operation of siphon 62 in the eventthat the control ofa greater amount of liquid than'could be provided by siphon 6| isdesired.

Since the purpose of the pilot sip-hon .68 is to provide only a minimumilow of liquid Ypassing from the constant level chamber, its internaldimensions will be considerably smaller than either of the other siphons6| and 62, andV by vadjusting the height of the pilot siphon 60 withrelation to the liquid level in the constant level chamber 50,l theminimum flow may be regulated. `Wh`en the pilot siphon 60 is initiallyadjusted with relation to the liquid level in chamber 50 so that only arelatively small amount of liquid could pass through the siphon, thersurface tension of the liquid across the end of the tube tends to forma membrane which prevents the, formation of a drop and thus prevents thestarting of the pilot ow. To overcome this effect, a clip member 84 isfastened on the end of the conduit with its lateral portions extendingbelow theend of the tube. This arrangement causes the'meniscal envelopeto wet the interior sides of member 84 and flow to the bottom thereof,softhat a large drop is thus formed which will more readily separatefrom the member 84. This clip 84 therefore permits a much moreeconomical pilot flow than would be otherwise possible.

The amount of nquid which wi11f1ow through' the siphons depends onseveral factors including the viscosity of the liquid. Whenthe liquid iscold, its rate of flow will be'retarded, and when the liquid is hot, itsrate of ow is accelerated. The purpose of bimetalportion 55 oflever53vis to so vary the level of liquid in chamber 50 upon changes inthe temperature of the liquid therein as to maintain the flow throughthe siphons substantially constant, irrespective of changes inviscosity. In order to make the siphons operative when the apparatus isinitially installed, it is necessary that they be properly primed, andunder ordinary conditions when once primed the siphons retain liquidwithin each of the legs even when the siphon is in a raised positionsince both legs are of equal length.

While the siphons described heretofore have been constructed with legswhich are of substantially .equal length,wherein flow control isobtained by moving the siphon with relation to the liquid level, thecriterion of flow control with such an arrangement is the differencewhich exists between the liquid level in the chamber and the position ofthe terminal end of the external leg of the siphon. As long as theinternal leg remains below the liquid level, increased flow may beobtained by lengthening the external leg as by telescoping or othersimilar means which will accomplish this purpose. And assumingy the endof the internal leg constantly remains below the liquid level, flow maybe restricted by shorteningor raising the external leg to a point justshort vof being above the liquid level in the chamber. Y Therefore, itis within the spirit of the presentv invention that flow control meanssuch as 60, 6| and means shown in Figure 7, may be constructed with aflexible or expansible externa1 terminal portion. When in a normalinoperative position one of the legs of the siphon is preferablypositioned just below the surface of the liquid in chamber 50 and willtherefore serve to continuously replace any liquid which is lost eitherbyevaporation or other means from the opposite end of the leg. There isnot, however, sufficient head under such conditions to cause any flowthrough the siphon.

`Further, I have found thatwith the legs of the siphons made equal inlength, the siphons can be entirely removed from the liquid withoutlosing their prime. This is undoubtedly due to the fact that With legsof equal-length Yand sufficiently small diameter the tendency of the oilto flow out of the legs is overcome by the action of barometric pressureon the ends of the legs taken together with the surface tension of theliquid. For example, the siphon 60 may have an internal diameter ofone-eighth of an inch or even larger when using number one fuel oilwithout losing its prime. Perhaps even a larger internal diameter couldbe used, but this, of course, will vary with type of liquid used.

I prefer to make the siphons 6| and 62 of tubing having an insidediameter of approximately one-eighth of an inch. The larger thediameter, the greater the flow. The flow can also be increased by movingthe siphon further into the liquid. It follows Vthat with a smallerdiameter siphon larger Vertical adjustments are necessary to give apredetermined change in flow; this in turn means that the verticaladjustment is not so critical with a small tube as it is with a largetube. For this same reason I prefer to make the pilot or minimumilowsiphon 60 with an internal diameter of about one-sixteenth of aninch. Y

To prime the siphons, as for example, just prior to the heating seasonorwhen for any reason the liquid was removed therefrom, I have provided acasing 85, the greater portion of which is positioned below the normalliquid level. The

casingv`8'5.- is mounted. on plate 50 bythe rodsV 95 and isdivided intotwo sections having a plunger and. receiving sectionl 06 and a Siphonfeeding section Si', with the direction of liquidow inV dicated 'inFigure. l by Small arro-ws. rPhe plungerv manually operable and consistsof a rod 08 fastened to a disk '89Y which has init a plurality ofapertures 00. Below the Ymember 89 is positioned a washer 0| which iscfsomewliat narrower dimension than member 39 andVV is held by anenlarged head portion S2: offthe'rod 88, which in its downward positionfits in a small recess 93 at the bottom of chamber 80. When it isdesired to prime'the siphons, they are manually depressed for aconsiderableV depth within the liquid in chamber '81, and'` the rod 08is manually lifted and quickly depressed. The liquid in chamber 85 isengagedV by the washer 9| and is forced through the apertures ed with avelocity which willv be Suiiicient under normal conditions'to Yprime thesiphons. rAn arrangement is provided to prevent the accidental suckeingback of the liquid throughthe siphons` byan upward movement of theplunger. The washer 9 i is Slidably mounted on the rod 08 so that whenthe rod 08 is lifted waSher'Si falls away from the diskA S0 until it isengaged by the enlarged head section 03 leaving the apertures 90unobstructed for thefree passage of liquid therethrough. However,when'rod 88 is moved downwardly the washer 9| is moved against the disk39. to close the apertures 90 to provide the required piston action. Therecess 93 is provided so that the head portion 92 of rod 80 will notinder the full' movement' of the plunger in the downward Stroke.

Under the conditions Set forth above, the liquid will normally travelfrom the chamber 50 through the device 85 and thence through the siphons|30 and 6| to a trough 06 and through the outlet 0l to a conduit leadingto the burner (not shown). However, since there is the possibility of anumber'of unsafe conditions which might arise either through the faultyoperation of the device or throughfaultyV operation of the furnace, anumber-of safety precautions have been incorporated which will renderthe device inoperative and thereby terminate the flow of liquid throughYthev device. If, for example, the inlet valve controlshould becomefaulty'and fail to close properly, the incoming liquid would overflowchamber 50 passing through the aperture 52 into a safety chamber |00below. A safety iioat |0| is positioned in the chamber |00 and is soarranged witha combination of elements to provide additional valveclosing means for the inlet valve assembly 30; Suitably fastened to thetop of float |0| is a lever 02 which is fulcrurned on pin`V |03 ofbracket |013 with the freeA end of the lever 02 engaging a cut-outportion letV of Ya lever I 05.` The lever |00 isl thus held in a'downward-position against the bias of an expansion spring |07 which isfastened at one end to the plate -53 and is fastened at the other end toan abutment |00A which is also fastened on lever |00. In the event thatliquid enters the overflowY chamber |00, the float |0| is raised by itsbuoyancyuntil the'free end of Ylever |02 moves out of engagement withthe cut-out portion |05, whereupon the spring |074 causes lever ille tomove upwardly with a Snap action. A second abutment lll-which-issuitably fastened to lever |06 engages onecf the extending arms v5lwhich forman extension of lever"53, in- Such Va manner as tocausel;vigorc'ius'-v engagement of the` lever 53 withthe head 0| ofvalveil to thereby closel thevvalve with a snapaction. VThesprii'ig |01vvhas suflicient strength to` hol'd the weights 53- in a raisedfposition,andfsince this will cause a rotation of the lever` 53 on the pivots 50and 56, the inlet Valve 38iwill be held ina closed position by thecombination of/ the strength of spring |0!` and the weight of the liquidin chamber 50 which is ample-,to positively preventV further ingress ofYliquid. Y v

When the safetytrip4 mechanism has been automatically actuated,V thevdevice becomes inoperative and must befmanually reset. To accomplishthis, cover 'I9' must be removed and an extension of'rod |06 whichprotrudes through plate 08 is manually: depressed. Depressing the lever|06 causes abutment |00Y to move away from the weightedv extension 5-1of the lever 53Y to thereby free the valve mechanism and restore ittonormafl control bythe counterbalanced chamber 50 and lever 50.Continued downwardmovement of` lever |00 causes the abutment |09 toengage the rounded portion |f|0 of lever |02 to' cause a depressing ofthe float |0| in chamberv |00 back to its lowervinoperative position andengagement of the free'end ofV` lever |02 in cutout portion |05 of lever|05. Lever ilis thus again held in its lower inoperative positionagainst the biasrof spring |01. y

It willbe observed'that'a Siphon lil is mounted in the cut-out portionIIS of casting l0 which forms the chamber |00. legs of unequal length.rilhe longer leg is positioned in the outlet Sl'while the shorter leg ispositioned within a depression, of chamber |00 so that as thefloatmember|0| is depressed, causing a displacement ofthe liquid in chamber |00,the Siphon ||5 will be primed by the upward surge of liquid through itsinner periphery and thereafter chamber |00 will be substantiallyemptied` by the action orV siphon H5,A thus permitting the liquid topassout through the normal outlet 0l.

The safety chamber |00 andits coacting parts is adapted to Serve as asafety device in a Second manner in that theY complete structurev ismounted onthefurnace |5 in such a manner that the height of the top ofthe. vaporizing burner (not shown) is slightly above the top of thevwall|||.'v In the event of flame failure and accumulation of liquid unburnedfuel in the burner and in theconduit extending from thecontrol device,suchunconsumed ,liquid fuel will back up into the conduit and trough 96.untilit overflows the cut-out wall portion. Ili or passes through Siphon||5 into the safety chamber |00 thereby causing float.Vl '|0`|` to rise,bringing into operation the action of the` safety trip mechanism setforth hereinbefore. YWith this arrangement, it willv be'evident that ifvfora-ny reason the burner fails to function in aproper manner' themechanism is operableto shut off further The Siphon H5 hasV fuel passingfrom either siphon from the troughv 96 to the safety chamber |00 4tocause a raising of float ||l| and a shutting down of the kdevice in themanner previously described'. A bellows |20 is connected with a conduit|2| 'which 'in turn isconnected .toa bulb mounted in the top of thefurnace (not shown). The system wouldv contain an expansible fluid orvolatile fill being of such character and quantity that when apredetermined high temperature has been 'exceeded by the furnace theclosed end of the bellows |22 would extend to the right as shown inFigure 6, and cause rod |23 whichforms an extension of bellows |22to'engage the lower portion of a rotatable balancedvplate |24, which ispivotally mounted as at |25 on an extension of wall ||6 in such a mannerthat the upper portion of plate |24 passes outwardly under the siphonsand diverts the flow of liquid fuel into chamber |00, thereby `causingthe device to become inoperative' in the manner previously described.

It should be understood that the safety fea-'- tures described above donot constitute an ad,- mission that the device described hereinabove hasinherent weaknesses, but instead they have been provided to make thedevice and the furnace with which it is connected, safe for purposes offor terminating the flow of liquid in the eventV that an unsafecondition'should arise. AIn this arrangement, chamber 50 has mountedwithin it a smaller casing which isv of somewhat different structurethan casing 85 shown in Figure 1, but Vwhich is divided into a largechamber |3| and a smaller chamber |32, having a small opening |33.PositionedV within'the chamber-is. one leg of a siphon |34V having acollar |35 in engagement with the vertical 'walls of chamber |32. Aprimer, consisting of a piston |36, is mounted on the lower end ofashaft |31 which lever.' |40 and by. the action-of spring 1143, rou v|31 will "be f'violently moved upward' until stop |44 engagesv the-lowersurface ofplate 63a. The

rapid upward movement of "piston |36 will cre" ate a suction in chamber|32 which will cause the liquid to be sucked in a backwardv direction-Ythrough the SiphonA |34 and inwardlyv through the opening |33 in: suchka manner'as 4'to 'discontinue the flow of liquid through siphonf|34.`

Where this arrangement is used to initiate the f flowv of liquid fueltoa burner of a furnace, in'.

order to provide for 4a safe upper-limit control-,i

a bellows arrangementV is'- connected on'itsv outer end with 'conduit|4511v to a fluid'bulb in contact with another part ofthey furnace.`lThis thermostatic control contains -a-suiiicient 'quan'- tity and'quality of expansible fluid or volatile ll so that-whena'fsafeupper'limit of tempera-f pansion thereof '-S'uitably fastened'to theclosed end `of bellows |45,1as'by means |46, isf a rod" |41 which, asthe bellows expands, will engage a depending portion |48 of lever|40,therebyi causing the levert'oA move away from the cut# -out portion|39 of shaft |31 toth'ereby `permit spring |43 to violentlymove's'h'aft|31upwardlfy until the stop member |44 engages'fplateGa'as: previouslydescribed, to thereby Yauto rnaticall'y terminate the flow of liquidthrough Siphon-|34.'-

'Figures and 9 show two ot'ljier varrangements? of electricallyresponsivev means for automatically controlling the flow of .liquidthroughthe' sip`lfion"v 'in response toV an electrical impulse; vInorder to better illustrate these modications,"the I'two has a knurledknob |38 for manual operation.

To initiate owof liquid through siphon |34, knob |38 is depressed untila cut-out portion |39 in shaft |31 engages a lever |40,'at which pointthe piston |36 will be in the position shown in Figure 4 and the liquiddisplaced in chamber I3 I will have been caused v-to flow in thedirection shownl by the arrows through Siphon |34 and outwardlythroughtheopening |33 because of the restriction in chamber |32 .causedvby the collar |35. This willginitiate .flow of liquid through theSiphonv and thereafter additional liquid will enter the .chamber/'|32through the opening |33. Rod |31 is'held in vits lowerposition byengagementof lever Y|40 with cut-out portion |39 by the .resilientYstrength of spring |4|y acting on lever |40 through pivot A|42 (see Fig.5). In the event Ythatfit is desired to manually discontinue flow oflquidthrough the Siphon |34, rod |31 may berotatedso thatV thearrow.seen inFigure 5Lwill point downwardly, therebyv causing cut-out portion|39 to disengag'e from I @bereut/terminating. thaflgwfef fquidjthroegh,Siphon and possibly Asucking a Ycertain amountsiphons are in eachcase'shown as discharging over opposite sides of ,.the-constantlevel:chai/niE ber. In the modification shown in Figure-'8; pilot` siphon E!!has a winged arrangementor clip .34; and isnioun'ted'` in a' fixedrelation with respect to plate 63h.' vA'siphon |50`is also shown asbeing mounted in fixed relation to plate 68h 'and would be `of the' samegeneral structure .as siphons 56 and 32. `Within the constant levelchamber which is adapted to maintainaconstantlevel of' liquid along theline'XJ-X'is shown another typeof priming casing |5| which! may be'madeby moulding, and closed yofi with 'a plug |52,` thus" l forming threechambers |53, |54 and |55, with communicating aperturesl |56 and |51,between the center and side chambers; fAs the casing |5|; is situatedbelow thevliquid leVeLliquid willy'be free to enter through apertures|53, |59v,'and |33'.

A priming plunger is provided with a pistonjli attached to the lower endof ,shaft |62 and havingV therein a hollow bore |63 communicatingwith'an atmosphere through Yan vaperture |65, An elec;-

tromagnetic solenoid |66 rothereleetrical rev-f will y'bel inloperation; and will beV conductingV fluid outof the chamber 50. Assumethe pilot Siphon 60 to bein operation.v Upon an yelectricalv impulse,receivedby thev solenoid-* |655,A the core'wilijbe drawn upward within`thercfoil of the 'solenoid thus mrovingrod |62 upwardly with al rapidacl. tion. ApsA the piston |6| moves-:upwardly past tlie aperture |51,it will create a suction. incha 11 of air in through the Siphon from theatmosphere. As the piston moves further inits upward direction, it willtend to compress the liquid vwithin chamber |54 and Yforce it to passAoutwardly through aperture '|55 into chamber |53 until nally the pistoncomes into contact withl stop member |61 which is positioned withinchamber |54 and serves to prevent piston |6| from closing off the areabetween aperture |59 and aperture |56. 'I'he upward movement of thepiston will Vcause increased pressure of liquid in cham.

ber |53 thereby initiating flow of liquid through siphon |50, and theliquid may thereafter continue to lflow in through apertures |59, |59,chamber |573, and outward through Siphon |50. During this period, anyair which was entrapped under piston |6| byy virtue of the suctioncreated on'siphon 60 will be free to escape through apertureV |64, theinternal bore |63 and aperture |65, thus preventing the formation of anair pocket under the piston. When theY need for a flowV of a largerquantity of liquid has been satisfied, the solenoid I 66 is deenergizedand either by the weight of the piston or with the assistance Vof springbiasing means (not shown) the piston |6| returns to its lower position.As it moves away from the stop member |61, the piston l! through theaperture |51 into chamber |55 withY suiicient force to cause a reprimingof Siphon 60 to reinitiate pilot fiow.- ,y

In Figure 9 is shown Vanother modification of means for 'automaticallyregulating the flow of liquid through the Siphon. In, this arrangement apriming casing |10 has -alarge chamber |11 and a smaller chamber |12,having a plug |13 fitting Vin` the vlower portion of chamber |1| whichis provided with an inlet aperture |14. Another aperture |15 providescommunication between the upper portion of chamber |1| and chamber |12.AApertures |16 and |11 in the upper surfaces ofthe two ,cylinders permitthe ilow of liquid into the separate chambers since the device l|19 ispositioned below a substantially constant liquid level line X-X in theconstant level chamber 59. The main Siphon |19 is provided with acylindricalpiston |19 which is in close engagement with the cylinderwall of chamber |1|. A rod |80 is affixed to the central upper portionof Siphon |18 and by a pivot pin IBI, is connected to lever |82, whichis rotatable upon a fulcrum |83, having a second pivotal connec- 'Y inthe chamber |1| will in part escape through the aperture |14 but sincethe piston |19 moves Y very rapidly, the liquid. below the piston tendsto become compressed and moves upwardly through the Siphon |18 toinitiate liquid flow. The liquid entering aperture |14 will thereaftercontinue to flow'through the Siphonv |18. Howeveig'the rapid downwardmovement of piston |19 causes a condition of reduced pressure to existin the upper portion of chamber |1| therebydrawing liquid 1'2 fromchamber- |12 and' also some liquid through theaperture |11. Thewithdrawal of liquid from chamber |12 causes a Suction uponrthe pilotSiphon 55, thereby Suckingback the liquid from said siphon andterrr'iinating the flow through the pilot Siphon. When the demand forliqui ow through siphon |18 has been satisrled,-the solenoid |81 becomesdeenergized and spring |95 causes lever |82 to rotate in a clockwisedirection,`

thereby violently movingrthe piston upwardly until it engages a stopIlla. which prevents obstruction of aperturese |15 and |11 by thepiston|19. This secondary motion creates a pressure in the upper portion ofchamber |1| thereby in the drawings.

through the pilot Siphon |50,V but the upward movement of the piston |19creates a suction inv the lower part of chamber |1| which cannot besatisfied by the flow of liquid through the aperture |14, and thereforecreates a suction in the siphon |18 to cause the liquid therein tobedrawn inwardly, thereby terminating the dow through Siphon |18.

In Figure 'lis shown an alternative structure which may be used Vfor aliquid conduit in kplace of the siphons which have been shown elsewhereThe arrangement consists of two pieces of flat metal and |9| formed inan inverted U-Shape and situatedone vwithin the other so that the spacebetween the two membersj is relatively slight, say 52? when using numberone fueloil. The two pieces are joined at their open ends by Solderingasr shown at |92 or other means for joining. A rod` k|93 is fastened tothe upper curvature V'of the external member |9|, and any ofthe meansVshown hereinbefore may be utilized for positioning the device withrelation tothe head ofthe liquidlin the constant level chamber or thelike. I'ghave found that by lowering such a device in a liquid chamberwith one leg thereof extending externally of the chamber, liquid will bemade to flow from the liquid flow, further vimmersion with relation tothe liquid level causes an increase of flow. 1 Since this device doesnot have to be primed, a device of this nature could be substitutedwithout the necessity of the priming means shown heretofore and wouldsuitablyv control the flow of liquid merely by movement Yof the devicewith relation to the level of thev liquid in the constant level chamber.y Y Y A device of the nature. disclosed in Figures 1 and 2 may beadvantageously used in a system such as shown in Figure 10 to controlthe flow of liquid fuel to a liquid fuel burning furnace so as toprovide three alternative rates of liquid flow.l In the diagrammaticillustration of Figure 10, the chamber V5|) is assumed to be associatedwith means disclosed heretofore for maintaining a substantiallyvconstant level of liquid fuel as indicated by the lineX-X. The pilotSiphon 60, being equipped with member l81|, is assumed to be properlymounted ,in relation tothe chamber 50 as also are the main flow controlsiphons 8| and 62. It is further. assumed that all three of the siphons60, 6| and 82 have been primed and likewise equipped with'a similar`actuator.70a

which is alsol in .heat transferrelationship'. with a heating element 'lIa.- A transformen |901 having a'primar'y coil' |9| anda'Secondary'coi'l|192, hasaY source of linevoltage*supplied'toJ-the'primary'throu'ghflea'ds' 1933194. 'Aspa'cethermostat |95 of 'the usual` bimetallic 'structure' 'is Tar'- ranged'to be 4mounted -in an' apartment'. whosev temperature is to'becontrohedand* is capable of warping.inv'two"dir`ections 'infre'spo'nse to achange of temperature as indicatedgbytthexletters C and H. Thethermostat. |95 has 'two co'ntact blades' |96 and'|9'|,'.1f1aving"vcontacts |98, |99; 'The member |'9'5'is electricallyconnected to -th'esecondary coil through .:condu'ctorff'A 200. The .contact |98 isVarrangedfto engage'. contact which is connected by .conductor'120`3ywith Y one end of the' heater 1|, andl Contact` |'99'i`sarranged toengage' contact 202 Vwhich is 'connected by conductor 204 with'one. endof the heater la. A conductor 205.-connects With the .aid of branchconductor' 206, the'opposite' ends of the heaters and 1| awiththeopposite endfof .secondary coill92. L j ff Assuming thetemperature within. the .apartment is within predeterminedsatisfactorylimits, the device will be in `the inoperative positionshown, with. the thermostat blades a away from 205' back' to thesecondary |92;l the temperaturel of heater rises, thebimetali.,'|0-warps downward lowering" the 'Siphon 6 .with relation tothe liquid fuel level in chamber, 50-and;.liquid fuel will commence toflow through siphon'l -to supply, with the pilot, flow vfrom;siphonA60,; an intermediate quantity. ,of liquid fuel-' Ihis arrangement willnormallyv supply' suflicient fuelqto the burnerto'restore thetemperature to normal, but if .the temperature ,continuesv to -decrease,on thernext increment of movement of the-thermostat |95 the blade|91jwill causev engagement of contacts |99, 202which setsup a circuittoheater 'Hd as follows: from secondary |92; conductor 200, thermostat|95, blade |9'|,fcontactsj |99, 202, conductor 204, heater 1|a,conductors 206,. 205, back to the secondary |92. .With "a rise-oftemperature of resistance heater 1 la the'bimetalla warps downward tomove Siphon 62 into operative relation with respect toV the. levelA ofliquidin chamber 50 and'all three sphons 60, Y6|,; and 62 will permitthe flow otliquid l,fuel toi'urnish'faI maximum flow offuel `to theburner-.A Whenjthe demand forincreased heat has, been? satisfledthethermostat |95 will'move inthe vdirection of the legend' H and willsequentially disengagecontacts 202, |99A to restore Siphon 62 togitsinoperative position to restore intermediate fuelflow, and later, onfurther-rise `of;temperature,*the disengagement; of contacts420|,j|9|3,v to restore sip'hon 6| to its inoperative 'position thusYpermitting only the'constant minimum flow through the pilot siphon160.

The advantages of the devicesdescr'ibed hereinbefore are numerous.Primarily,` I' have provided a means 'of metering liquid which rispositive in its'action and yet which may be controlled withA extremeaccuracy'. As-a means o'f controlling the flow of liquid fuel to an oilburning furnace; it will be seen that devices of this 'nature are freefrom the faults of priorl art 'because residual matter in the fuelwillnot be ableto settle` in such a way as to' clog` the'passage throughof fuel which vthe'fuel must flow'. Secondly, I have providedvanunrestricted'conduit forr the.. flow of liquid wherein 'the flow "maybecontrolled by moving the conduit with relation Sto'the .hea'd'of liquid'in 'a reservoin Thirdly, I'lhave' provided e means"iofobteiningfvarianijiates of nowrof liquid by the'simplest' 'form ofmechanisms; which are inexpensive t'o lmake andwhich will 'not readny."get out of order.l Feuruny, finy device eentaiiis a' novel'iltering'arrangement Vwhereby the filter eiemejntmaybe removed Ifio'r'rifth'etopef the tievie'e'tiiereb'y ebviatiiig thespiiiage of liquid which' wasunavoidable when' the iilt'er' lelement was positionedb'en'eaththedevice inthe manner shown inthe prior-tart; "Fi`fth`ly,' since thevdevice is primarily vintended to ontr'ol t theflow `'cfu liquid fuel tofurnacefthefdevice contains saffety features which' are voperabl" tr'ofpl'ae'e 'the f1 .-1'rnace in a safe condition under" Vycohceivablecmbination of circumstances.' Lastly-Lsincelthejdevice ismade upof relativelymfew'an'd simpleparts'it lmay be made inl'averyinexpensive"manner and still'maintain a-high degree' ofcontrol-.of the. ow of liquidiuelandyet 4 device forms 'aneatandattractive package v g -i ',g n 1 It Will be QbYiOuS.'thatzmanyfhheesmay'be made' inv 4the apparatusherein .disolosed'without departing .frvmfthes pii'. .'Of. fmy invention, and such changesV are. intendedl'to becovered `by the appended claims'.

I claim as my invention 1. A liquid` ilove/control l Y Y device,comprising, a chamber for receiving lid id,' means for `controlling floWofliquidinto'4 saidichamber to maintain a i substantially;constant-level of 'liquiid therein when said device isconnected toaliquid supply, a siphon for lifting liquid. out of said chamber at a`rate dependent v.upon` thefrelativeverticalV positions` of theliquid),injsaid chamber 4vand the 's iplion,i j overflow means,associated with said chamber having control",'means` for stopping theflow of liquid intofsaid chamber' and having a siphon adapted to',vdrain said voverow'jmeans upon the resetting of said' control means intoits liquid flovv permitting' position, and means to thereaftervarythe'relative'Y vertical positions of said'chambei` and 'saidfirstnamed siphon.

2. A liquid flowcontrol, comprising, -a chamber for receivingliquidasiphonffor lifting liquid out of said chamb'ensaid si'phon being of.such. small cross-sectional area andthe e-iiective liquid head actingupofn the sameb'eingoi'lsuch smal-l amount that discharge fronisaid.Siphon-'is prevented by the surface tension .of the liquid atthedischarge end thereof, and means associated` withy the discharge end ofs'aid sipl-ion` to lessen thefsurface tension of the liquid at theendfofethe Siphon movable liquid vreceiving `chamber, 'a counterweightassociated Withsaid chamber for .moving said chamber .in one direction,said chamber and said counterweight being spaced from a common pivotthus y'providing''moment-arms for each, the

ychamber when containing a predetermined chamber, and .means .responsiveto the temperature of said liquid to vary the moment arm of saidchamber-so that the weight of liquid in said chamber that is required tocause movement of said chamber in ksaid Ysecond ldirection is variedlv.

4. A liquid iiow control device, comprising, a movable liquid chambermounted within said device, flow'control means associated withsaidchamber to normally maintain `a substantially constant liquid level insaid chamber, aV lever operably associated with said chamber and said owcontrol means and having a, pivot spaced from said chamberand flowcontrol means, and means operably connected to said movable chamber andsaid lever and controlled by the ambient temperature of the liquidwithin. said chamber to vary the distance .between said chamber and saidpivot toA raise. or lower the predetermined height of saidliquid'levelzby varying the force applied'to said'flow control means bysaid lever and movable chamber.-

.5. A 'liquid flow control device,Y comprising, a

Vchamber for receivingliquid, movable means for' varying the flow ofliquid into said chamber, members connecting between said chamber andsaid movable means by which said .movable means is operated tol reducethe-now of liquid .tosaid chamber by the weight of liquidlin saidchamber,V a'constantly open means located adjacent said chamber forconveying liquid from said chamber, and means for .moving said chamberand said .liquid conveying means relative to each other to startand stopthe Vflow of liquid from said chamber, and second means for'moving saidchamber relative to said movable means to vary the vweight ofliquidrequired to reduce the flow thereof.

6. YA iiquianow control devicecomprismg a movably mounted' main liquidchamber, liquid inlet control means controlled by the movement of saidmovable chamber for directing and controlling the flow of liquid to saidchamber, means for only discharging liquid from said chamber, anauxiliary Vchamber having liquid level control means, spring biasedlatchmeans associated with said auxiliary chamberl liquid level control meansand said inlet control means for positivelytermi-v charging liquid:fromV said auxiliary chamber when said latch means is manually moved toits latched position. y f

y 7. A liquid flow control device, comprising, a movably mountedmainliquid chamber, liquid inlet control means positioned above saidvchamber and controlled by the movement of said movablechamber fordirecting and controlling the .16 iiow of liquid to said chamber andhaving an operative position and an inoperative position, an auxiliarychamber .having liquid level control means having an operativepositionand an vinoperative position, means associated with saidauxiliary'chamber'liquid level control means for positively terminatingingress of liquid vto said movable' chamber byy placing said liquidinlet controlr meansv in `said inoperative-position when the liquidlevel in'said auxiliary chamber exceeds a predetermined level and causessaid liquid'level control means to move toits inoperative position,

and manually operable means yfor-.resetting said liquid inlet controlvmeans andlsaid'liquid oontrol means to their operative positions, saidliquid level control having a Siphon-thereon for discharging .liquidfrom the auxiliary chamber.

8. vA liquid flow 'control'.device, comprising, a

iirst movable liquid chamber, liquid inlet con trol means operably'connected `to said chamber for maintaining a Asubstantially constantliquid level in said chamber, means for 'conducting'liquid out of rsaidchamber, means responsive to'a conditio'nothe'r than a flood conditionand asso- Y ciated with said device for deiiecting the'ilow of liquidemitted from said first means into a-second chamber, and meansassociated with said secondchamber operatively connected to said inletcontrol means for terminating the ingress of liquid to said firstchamber When the liquid llevel in said second chamber Vexceeds apredetermined height. m Y Y 9. A liquid Aflow controlling device,comprising,

a movable chamber for receiving liquid, means said overflow 'means whensaid condition arises'.

10. A liquid ow control device, comprisinga chamberfor `receivingliquid,movable means :for varying the ilow of liquid lintosaid chamber,connections between said chamber and said movable means by which saidmovable means'is operated to reduce the now of liquidto said chamber bythe Weight of liquid in "said chamber, overflow means forreceivingliquid overflowing from said chamber, means by which saidoverflow means stops the flovv of liquid into said chamber, means forconveying liquid from said chamber away from said device, and conditionresponsive Amovable means for deflecting the liquid conveyed from saidchamber into said overflow said condition exists.

11. A liquid 'flow control device comprising, a chambervfor liquid,means for conducting liquid into said chamber, a'siphon adaptable forconveying liquid from said chamber, means for forcing liquid into saidSiphon to establish afflow of liquid from said chamber, 'means formaintaining a substantially constant level ofliquid in means when 117chamber', means for'conducting liquid out of said liquid level chamber,an outlet formed as a portion ofl said device for conveying liquid fromsaid device, float actuated means associated with said inactive chamberfor controlling the flow of liquid to said liquid levelV chamber, and asiphon'in said device with one leg thereof positioned.V toldischarge-liquid into said outlet and the other leg positioned towithdraw liquid from said inactive chamber for conducting liquid fromsaid inactive chamber to said outlet, the float of said float actuatedmeans serving to prime said siphon upon being lowered into said inactivechamber.

13.l A device for controlling the flow of liquid fuel to a burnercomprising, a chamber for receiving liquid fuel, means for controllingthe'flow of liquid-fuel to said chamber, overflow means for collectingliquid fuelY` overflowing from said chamber as a result of an abnormalcondition, connections between said overow means and said liquid fuelflow controlling means to stop the flow of liquid'fuel into saidchamber, a siphon for conveying fuel from said overflow means, a siphonfor conveying liquid fuel out of said chamber, and a single fuel outletfrom said device adapted to receive fuel directly from said siphons andsaid overflow means. v

14. A liquid flow control device comprising, a chamber for liquid, meansfor conducting liquid into'said chamber, a siphon adaptable forconveyingliquid from said chamber, means for forcing liquid into saidsiphon to establish a flow of liquid from said chamber, means formaintaining a substantially constant level of liquid in said chamber,overflow means to collect liquid overowing from said chamber, meanscontrolled by saidv overflow means to stop the flow of liquid to saidchamber, and condition responsive means to deflect the fiow of liquidfrom said siphon into said'overflow means.

l5. A liquid flow control device, comprising, a movable liquid receivingchamber, a counterweight associated with said chamber for moving saidchamber in one direction, said chamber and said counter-weight beingspaced from a common pivot thus providing moment armsforeach', thechamber when containing va predetermined Weight of .liquid overbalancingsaid counter- Weight and moving in a second direction, means foradmitting liquid to said chamber, connections by which movement of saidchamber in said second direction operates said liquid admitting means toreduce the flow of liquid into said chamber,'means responsive to thetemperature of said liquid to vary the moment arm of said chamber sothat the weight of liquid in said chamber that is required to causemovement of said chamber l in ysaid second direction is varied, andmeans for discharging liquid from said chamber.

f 16. Afliquid iiow control device, comprising, a movable liquid chambermounted within said device, iiow control means associated with saidchamber'to normally maintain a substantially constant liquid level insaid chamber, a lever operably associated with said chamber and saidiiow control means and having a pivot spaced from said chamber and iiowcontrol means, means operably connected to said movable chamber and saidlever and controlled by the vambient temperature of the liquid withinsaid chamber to vary the distance between said chamber and said pivot toraise or lower the predetermined height of said liquid level by varyingthe force supplied to said flow control means by said lever and movfromsaid chamber'. f.

Y17... A liquid flow control device, comprising, a.

v movabl'eliquid chamber `mountedwithin said device, oyv control meansassociated with saidchamber Vto lnormally. maintain: ai 'substantially iconstant liqui'dflevel in'said-` chamber; a vlever operably. associated"withrs'aid'ch'amber 'and saidv flow control. means and lhaving apivotspaced v from saidchamber andiiow' control means, means f operablyr'connected to said Vmovable Chamberland.

said leverand controlled' bythe ambient vtemperature 'f the :liquidvwithin said'cliamberto vary the distance between said chamber and:said'pivot to raise or lowerllth'e predetermined'hei'ghtlof` saidliquidv level by .-varying'- the force .supplied to saidy control means'.bylsaid lever.l andi movable -chamber, a 'siphont mounted adjacentrisaid.chamberv for conducting liquid, out .of said chamber,manually' operabler means: fori iniltiatingzffiwofl liquidv through saidSiphon,andxthermostatic. mea`ns`op-l` erably associated with saiddeviceforitermin'ating iiow. of liquid through said siphon.. .1 I..

41.18.' A liquidflowfv control device, comprising, a;

movableA liquidi. receiving .chamber, .a :counterweight associated 1with Asaid .chamber for: movingv said chamberin onezdirection;saidchamber and said counter-weight being spaced noma-common pivot thusproviding moment arms LfrQeaclo, Vthe chamber when containing apredetermined vweight of liquid `overbalancingusaidcounter-weight andmoving in a second .directionymeans'for admitting liquid to saidchambenconnectionsby'which movement ofsaidv chamber insai'd .secondfdirection operates said liquid admitting means ctc -reduce the ilowof.liquid into said: chamber; means responsive to lth'e..'-teniperaturef.`of saidtl-iquidzr. to. vary the moment ar'rniof-#said:chambersobthat;` f

the weight of liquid.in-said'chamberithatistrequired to cause movementmfisaid: chamber iin. saidsecond direction. is varied,'a`.sipho1rfo`rcon`r veying liquid from said.chamber,'means for .selectively forcingliquid. intoiand out ofY said siphon:

for establishing and discontinuing flow ofliquid fromsaidchamber,.manual means for operating. said forcing means to establishiiow of liquid,

forcing and automaticineans forroperating said means to discontinue-saidflow.; 55: fl

19. A liquidflow control;device,comprisingV a movableliquidchambe'rmounted.within said Vdevice, iiow control means@associated :with said chamber to normallyy maintainasubstantiallyconstant liquid level i'nisaid=.-.chamber,.a 'leveroperably associated witn'said chamber and .said iiow control .meansand-having a pivotspaced from said chamber and iiowcontrol means, meansoperably connectedxto. said. movable'vchamberf and saidkleverandzcon'trolledfby the -ambienttemperature .of `.the liquidiwithinsaid-chamber ,to vary the distance` betweenfsaid chamber andsaid lpivotto raiseilor'lower :.thefpredetermined height of said liquid levelbywvarying the l;force.'.supplied tosaid iiow control means by saidleverand, said; movable chamber,` rst Iandsecond siphons. for conveyingliquid out;ofsaidchamberat different rates', 'and.means-,selectivelyoperable to. force liquid into the first of saidsiphonsandcut of the second thereof or to force liquid intothe second ofsaid siphon and out of the first-)thereof, whereby one or'the other ofsaid siphons is selectively renderedoperative to convey liquidout ofsaid chamber. Y ;v

20. A liquid ow control device, comprising, a movable .liquid receivingchamber, a lcounterweight associated withsaid chamber forzmoving tingliquid to said chamber, connections .by which movement of saidchamber insaid second direction operates said liquid admitting` means to reducerthe ow of liquid into saidichamber, rmeans responsive to thektemperature of saidliquidatoV vary the moment arm oir' said chamber'sothatA the weight of liquid in saidchamber that is required tocausemovement of said chamber in saidsecond direction is varied, rst andsecond siphons for conveying liquid out of said chamber` at diii'erentrates, and plunger means which whenr4 operated inarst direction forcesliquid into said rst siphon andr out of said second Siphon and whenoperated in a second direction forces liquid into said second siphon andout of saidrstsiphon. j

21. A liquid owcontrol device, comprising, a movable liquid chambermounted within said de- Vice, flow control means associated. with saidchamber to normally maintainV a substantially constant liquid level insaidchamber, a lever operably associated with said chamber and said flowcontrol means and havingA a pivot spaced from said chamber and i'lowcontrol means, means operably connected to saidmovable chamber andv saidlever andfcontrolled by the ambient temperature of the liquid withinsaid chamber to vary the distance between said chamber and said pivot toraise or lower the predetermined height of said liquid level by varyingthe force supplied tosaid flow control means by said lever andvsaidmovable chamber, first. and second siphon for conveying liquid out ofsaid chamber. at 'diierent rates, plunger means which when operated inafirst direction forces liquid into said first siphon and out of saidsecond siphon and when operated in a second direction forces liquid intosaid second Siphon and out of said rst siphon, and electrical means incontrol of said plunger means.

22. A liquidflow. control device, comprising, a movable liquid chambermounted within said device, i'low control means associated with saidchamber Vto normally maintain a substantially constant liquid level inysaid chamber, a lever op.- erably associated with said chamber and saidflow control means andJhaving a pivot spaced from said chamber and flowcontrol means, means operably connected to said movable chamber andsaid' lever and controlled by the ambient vtemperature of rtheliquid'within said chamber to-v varythe'distance between saidichamberand said pivoty toraise or lower the predetermined height of said liquidlevel by varying the .force supplied to said iiow control means bysaid.lever and said movable chamber,l and means for lifting liquid out ofsaid chamber comprising a 'pair'of parallel closely spaced U shapedplates having one pair of their lower ends located within said chamberand another pair terminated outside of said chamber.

23. A liquid flow control device, comprising, a movable liquid receivingchamber, a counterweightassociated With-said chamber for moving.'

said chamber in one direction, said chamber and said counter-weightbeing spacedfrom acommon pivot thus providing moment armsffor each, lthepivotA thus' providing moment Y arms ,forreach,Y

Y the'chambervl'rhenY 'containing apredetermined weight; of: liquid.overbalancing said counter;t

weight and moving in a second 'direction-Y means' for admitting liquidtoysaid chamber, connections by which movement of'V saidchamber in said,

second; direction operatesv said liquid admitting means to reduce thelil'ow ofv liquid into said chamber, means responsive to the temperatureof said liquid toV vary the moment arm of said chamber so that theWeight of liquid in said chamber that is requiredto .causemovement ofsaid chamber in saidvsecond direction is Varied.

means for lifting liquidjoutoi said chamber 'comprising a pairofparallel closely spaced U shaped plates having one pairof their endslocated withinsaid chamber andthe other Vend of each plate terminatedoutside-.of said chamber, and means bridgingk the1ends of each pair ofplate'endsfj 24. A liquid iiowcontrol device, comprising, a movableliquid chamber mounted within said device, lilow control meansassociated with said chamber to normally n iaintain a substantiallyconstant liquid levelin said chamber, a'lever operably associated VwithSaid chamber and said flow vcontrol means and having a pivot spacedfrom-said chamber., and .flow control means, means operably connected tosaid movable chamber and said lever and controlled by the ambienttemperatureof the liquidwithin said chamber to, varythe distance betweensaid chamber and said pivot to raise or, lower the predetermined height'orsaidY liquid :lefvel by varying the-'force supplied to 'saidflowcontrol means by said lever and said Amovable chambenprst andsecond'siphons for conveying liquid out of said chamber at differentrates, and means movable relative to each of said siphons andselectively operable to force liquid into the rst of said siphons andout of the second thereof or to force liquidfintoA the second of vsaidsiphons and out of the first thereof, whereby one or the other of saidsiphons is selectively rendered opertaive to convey liquid out of saidchamber. A n

25. A liquid iiow vcontrol device, comprising,- ka movable liquidchamber mounted within. said device, `low control means associated withsaid chamber fto normally maintain a substantiallyV constant liquidlevel in said chamber, a lever operably associated with said chamber andsaid flow' control means and having a pivot spaced fromV 'said chamberand flow control means, means operably connected to said movable chamberand said leverand controlled by the ambient temperature of the liquidlwithin said chamber to vary' the distance vbetween said chamberand saidpivot to raise or lower the predetermined height of said liquid levelbyvarying the force supplied to said ii'ow control'meansby said lever andsaid m'ovable'chamber, first and second siphcns -ior conveyingliquid outof said-chamberat different rates, and means movable with one of saidsiphons 'fan-d selectively operable to force liquidi'intc thelrst-ofsaid'siphonsand outl of the second thereof-'or' to forceliquidintothemeans operably connected to said movable chamber and said leverand controlled by the ambient temperature of the liquid 4within saidchamber to vary the distance between said chamber and said pivot toraise or lower the predetermined height of said liquid level by varyingthe force supplied to said flow control means by said lever and saidmovable chamber, first and second siphons for conveying liquid out ofsaid chamber at diierent rates, and plunger means movable with one ofsaid siphons which when operated in a first direction forces liquid intothe said first siphon and out of said second siphon and when operated ina second direction forces liquid into said second siphon and out of saidrst siphon.

27. A liquid flow control device, comprising, a movable liquid chambermounted within said device, flow control means associated with saidchamber to normally maintain a substantially constant liquid level insaid chamber, a lever operably associated with said chamber and saidflow control means and having a pivot spaced from said chamber and flowcontrol means, means operably connected to said movable chamber and saidlever and controlled by the ambient temperature of the liquid withinsaid chamber to vary the distance between said chamber and said pivot toraise or lower the predetermined height of said liquid level by varyingthe force supplied to said ilow control means by said lever vand saidmovable chamber, a group of three interconnecting compartmentspositioned in said chamber, first and second siphons having legsextending through enlarged openings in a rst and a second of saidcompartments respectively for conveying liquid out of said chamber atdifferent rates, and plunger means within the third of said compartmentswhich when operated in a rst direction forces liquid into said iirstsiphon and out of said second siphon and when operated in a seconddirection forces liquid into said second siphon and out of said rstsiphon.

28. A liquid flow control device, comprising, a movable liquid receivingchamber, a counter- Weight associated with said chamber for moving saidchamber in one direction, said chamber and said counter-Weight beingspaced from a common pivot thus providing moment arms for each, thechamber when containing a predetermined weight of liquid overbalancingsaid counter-weight and moving in a second direction,

means for admitting liquid to said chamber, connections by whichmovement of said chamber in said second direction operates said liquidadmitting means to reduce the flow of liquid into said chamber, meansresponsive to the temperature of said liquid to vary the moment arm ofsaid chamberl so that the Weight of liquid in said chamber that isrequired to cause movement of said chamber in said second direction isvaried, a group of three intercommunicating compartments positioned insaid chamber, rst and second siphons having legs extending throughenlarged openings in a first and a second of said compartmentsrespectively for conveying liquid out f said chamber at different rates,and plunger means within the third of said compartments which whenoperated in a rst direction forces liquid into said first siphon and outof said second siphon and when operated in a second direction forcesliquid into said second siphon and out of said first siphon, saidplunger having a vent therein extending from the piston end thereof to apoint above said chamber.

29. A liquid ow control device, comprising, a movable liquid receivingchamber, a counterweight associated with said chamber for moving saidchamber in one direction, said chamber and said counter-weight beingspa-ced from a common pivot thus providing moment arms for each, thechamber when containing a predetermined weight of liquid overbalancingsaid counter-Weight and moving in a second direction, means foradmitting liquid to said chamber, connections by which movement of saidchamber in said second direction operates said liquid admitting means toreduce the flow of liquid into said chamber, means responsive to thetemperature of said liquid to vary the moment-l arm of said chamber sothat the weight of liquid in said chamber that is required to causemovement of said chamber in said second direction is varied, twointercommunicating compartments suspended within but spaced from thewalls of said chamber, a first siphon having one of its legs outside ofsaid chamber and the other leg extending through an aperture in one ofsaid compartments, and a second siphon having one of its legs outside ofsaid chamber and the other leg extending through an aperture in thesecond of said compartments, said second siphon having a piston on saidother leg adapted to selectively force liquid through one or the otherof said siphons and said second compartment having an opening in thewall thereof below said piston. v

JOSEPH O. THORSHEIM.

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